BUF16820 Datasheet, PDF (1/30 Pages) Burr-Brown (TI) – 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory

BUF16820
BU _{F168 20}
SBOS356A − FEBRUARY 2006 − REVISED OCTOBER 2006
14-Channel GAMMA VOLTAGE GENERATOR
with Programmable V_COM Outputs and OTP Memory
FEATURES
D 14-CHANNEL GAMMA CORRECTION
D 2 V_COM OUTPUTS
D ON-CHIP OTP MEMORY
D 10-BIT RESOLUTION
D RAIL-TO-RAIL OUTPUT
D LOW SUPPLY CURRENT: 1mA/ch
D SUPPLY VOLTAGE: 8.5V to 18V
D DIGITAL SUPPLY: 2.0V to 5.5V
D INDUSTRY-STANDARD, TWO-WIRE
INTERFACE: 3.4MHz HIGH-SPEED MODE
D HIGH ESD RATING:
4kV HBM, 1kV CDM, 200V MM
D DEMO BOARD AND SOFTWARE AVAILABLE
2V to 5.5V
BUF16820
Digital
8.5V to 18V
Analog
REFH
SDA
SCL
Control IF
LD
A0
REFH OUT
OUT1
OUT2
14 Output Channels plus
Two V_COM Channels
OUT13
OUT14
V_COM1
V_COM2
REFL OUT
REFL
APPLICATIONS
D REPLACES RESISTOR-BASED GAMMA
SOLUTIONS
D TFT-LCD REFERENCE DRIVERS
D DYNAMIC GAMMA CONTROL
DESCRIPTION
The BUF16820 is a programmable voltage reference
generator designed for gamma correction in TFT-LCD
panels. It provides 14 programmable outputs and two
V_COM channels, each with 10-bit resolution. It offers
on-chip, one-time programmable (OTP) memory that
allows the user to store the gamma voltages on-chip. This
eliminates the need for an external EEPROM.
This programmability replaces the traditional, time-
consuming process of changing resistor values to optimize
the various gamma voltages, and allows designers to
determine the correct gamma voltages for a panel very
quickly. Required voltage changes can also be easily
implemented without changing the hardware.
The BUF16820 uses TI’s latest, small-geometry analog
CMOS process, which makes it a very competitive choice
for full production, not just evaluation.
Programming of each output occurs through an industry-
standard, two-wire serial interface. Unlike existing
programmable buffers, the BUF16820 offers a high-speed
mode that allows clock speeds up to 3.4MHz.
For devices with a lower or higher channel count, please
contact your local sales or marketing representative.
The BUF16820 is available in an HTSSOP-32
PowerPAD package. It is specified from −40°C to +85°C.
BUF16820 RELATED PRODUCTS
FEATURES
18-Channel Programmable, Two V_COM Channels, Memory
12-Channel Programmable Buffer, 10-Bit
Programmable V_COM
10 + 1 Channel Gamma Buffer, 22V Supply Voltage
Complete LCD DC/DC Solution
PRODUCT
BUF20820
BUF12800
BUF01900
BUF11705
TPS651xx
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2006, Texas Instruments Incorporated
www.ti.com